Security door

Abstract

A security door for a gate or building opening is formed of a metal frame that defines a pair of hollow stile frame members and upper and lower hollow transverse rail frame members. Each of the frame members has an inner face with an attachment flange projecting therefrom. Security receiving apertures are defined in the inner faces of the frame members. In the fabrication of the door a plurality of metal security bars are positioned relative to the hollow frame member so that the ends of the security bars project through the security bar receiving apertures and into the hollow frame members. The security bars pass over and reside in contact with the attachment flanges. The security bars are spot welded to the attachment flanges so as to permanently secure them to the door frame. Also, the frame itself is preferably formed from a single, elongated strip of metal that is roll formed and then bent at mitered corner cuts to create and delineate the stile and rail members. Corner fastening tabs are preferably formed on at least some of these members so as to reside in contact with the ends of other of the frame members located immediately adjacent thereto. The fastening tabs are secured by spot welding to the adjacent members which they contact.

I claim: 
     
       1. A security door comprising: a mutually parallel pair of hollow, roll-formed sheet metal upright stiles having opposing extremities and with security bar receiving apertures therein and security bar attachment flanges thereon,   mutually parallel, hollow, roll-formed sheet metal upper and lower transverse rails formed with security bar receiving apertures therein and security bar attachment flanges thereon and connected to said extremities of said upright stiles and oriented perpendicular thereto,   security bars extending between said upright stiles, and through said security bar-receiving apertures therein and welded to said stiles at said attachment flanges thereon, and   security bars extending between said rails and through said security bar-receiving apertures therein and welded to said attachment flanges thereon.   
     
     
       2. A security door according to claim 1 wherein said extremities of each of said stiles have opposing ends and each of rails has opposing ends, and said ends of said stiles meet said ends of said rails to form four door frame corners, each door frame corner being formed by a single stile extremity end and a single rail end, and an attachment tab is formed at each corner extending from one of said ends thereof to overlap the other of said ends thereof, and said ends of said stiles are welded to said ends of said rails at said attachment tabs at each of said four door frame corners.